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Total Dynamic Head calculator This program enables the user to enter data pertaining to a specific rig's piping configuration and then utilizes this data to determine the correct line, pump, impeller and motor size required for proper operation of hydrocyclone headers. *Please note: This program is designed to provide a quick and efficient method for calculating total dynamic head. Derrick still recommends consulting a pump curve chart and reviewing the required NPSH and horsepower requirements for more detailed calculation. Please contact a Derrick representative with any questions.